Cut the tofu and green onion into bite-sized pieces.
Pour water into a pot and make broth using kelp and anchovies.
Dissolve the doenjang (soybean paste) into the broth and bring to a boil.
Add the tofu and green onion to the boiling broth.
Add zucchini, onion, and spicy green chili pepper. Boil until all ingredients are cooked through.
Add garlic and adjust the seasoning, then turn off the heat.